On 11/08/2012 02:45 AM, Stefan Priebe - Profihost AG wrote:
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd be interesting to
know how much the writer processes were shifting around on cores.
What do you mean by that? I'm talking about the KVM guest not about the
ceph nodes.
in this case, is fio bouncing around between cores?
Stefan, what tool were you using to do writes?
as always: fio ;-)
You could try using numactl to pin fio to a specific core. Also, it may
be interesting to try multiple concurrent fio processes, and then
concurrent fio processes with each pinned.
Stefan
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